[dune-fem] CombinedSpace Review

[Tobias Malkmus]

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Hi All

In the last days i reviewed all CombinedSpaces.
The two versions
CombinedSpace< ContainedSpace, N, DofStoragePolicy>
and
CombinedDiscreteFunctionSpace< Space1, Space2 >
are now derived by a PowerDiscreteFunctionSpace and
TupleDiscreteFunctionSpace.

Both are based on a generic combined space. The
PowerDiscreteFunctionSpace is designed to handle the case V_h^N for a
common discrete Space V_h.
It's dof blocking strategy is VariableBased, this means all DoFs
belonging to one subspace are stored consecutive.

The new generic TupleDiscreteFunctionSpace takes an arbitrary sequence
of Fem DiscreteFunctionSpaces, e.g. V_h \times W_h \times Q_h \times .....
Here the DoFs are stored in the same way as for the Powerspace.

Note: Both space implementations have performance issues which can not
be overcome without further interface changes of the BasisFunctionSets.
I will write another email tomorrow on this issue on the developer list.


Please test this spaces if you need them and report bugs.


Best Tobias



- -- 
Tobias Malkmus                 <tomalk at mathematik.uni-freiburg.de>

Mathematisches Institut               Tel: +49 761 203 5627
Abt. für Angewandte Mathematik        Universität Freiburg
Hermann-Herder-Str. 10
79104 Freiburg

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